You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation, as my holiday trip with my friends has been postponed. Can you help me?

ASSISTANT: Sure, we are here to assist you.

USER: Thank you.

ASSISTANT: Can I have your name to check your reservation?

USER: Sure, Rebecca Adams is my name.

ASSISTANT: Ok, please be on hold.

USER: Ok, make it fast.

ASSISTANT: Sorry, there is no reservation found on your name.

USER: That's ok, not an issue. Thanks for your kind help.

ASSISTANT: Thanks for approaching us, hope to serve you again.