You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what help  you are expecting from us?

USER: I have planned to go for a trip but it is postponed for another dates, can you please help me to change my existing reservation?

ASSISTANT: Sure, I will help you. Please tell me your good name, so that I can check the existing reservation?

USER: Ok, I am Frank Martinez.Can you please check out with that?

ASSISTANT: Sure, I will check. Please give me a moment.

USER: Ok, but please make it fast.

ASSISTANT: Sorry Frank, there is no reservation under your name.

USER: Ok, thank you.

ASSISTANT: Thank you for approaching us. Hope you will reach us in the future. Have a good day.