You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Rachel Thomas here.

ASSISTANT: How can I address you?

USER: Can you cancel my flight ticket reservation? As my business trip is cancelled due to change in the dates.

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Please wait a while.

USER: Sure, take your time.

ASSISTANT: Thanks for being waiting. We didn't found any reservation by this name.

USER: That is not a problem.

ASSISTANT: Thank  you for reaching us.

USER: Thank you.