You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Rachel Thompson.

ASSISTANT: How may I help you?

USER: I want to change my existing reservation, due to my family tour got postponed. Could you help me in changing reservation?

ASSISTANT: Sure. Please wait a moment, I will check for the reservation with your name.

USER: Ok.

ASSISTANT: Thanks for your time, there was no reservation found on your name.

USER: Not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your service.