It's a happy moment at end because he come back as what is his promise to her loved one

Before takeoff the plane

You promise me to come back

I smiled because I’m glad

Hope your promises come true

When you’re gone

I did not receive an email even a single one

Why it could be happened?

May be you forget everything

I’m sad and I missed you so much

I try my best to forget but I can’t do

As you promise me to come back to me

Until now I’m still waiting for you

I thought you forget me but I’m wrong

I received unexpected call from someone else

The voice is so familiar that I’ve missed

Now you come back to fulfill your promises