You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: I am Sharon Allen. Can you help me to change my reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Thanks for your time, there is no reservation found with your name.

USER: That is fine. Thank you for your help.

ASSISTANT: It's ok, thanks for contacting us.