You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I want to change my planning trip dates due to any emergency in my home, can you please change my recent booking?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: Can I have the name on which you reserved earlier?

USER: Yes, I am Raymond Jones.

ASSISTANT: Ok, please wait a moment and I will check for existence of reservation.

USER: Sure.

ASSISTANT: Sorry Raymond, no reservation has found under your name.

USER: It's alright, no issues with that one.

ASSISTANT: Thank you for choosing us.

USER: Welcome.