You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, may I know your name?

USER: Thank you for your response. My name is Sarah Hall.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us.