You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Melissa Smith.

ASSISTANT: How can I aid you?

USER: I want to change my existing reservation, due to heavy rainfall. Can you help me out?

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Thanks for your time.

USER: ok.

ASSISTANT: We didnt found any reservation by this name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.