You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me to change the travel dates in my past ticket?

ASSISTANT: May I know your name?

USER: Thank you. My name is Jennifer Scott.

ASSISTANT: Ok. Please let me check details with your recent reservation.

USER: Sure.

ASSISTANT: I regret, there is no reservation by name Jennifer Scott.

USER: It's ok, thank you.

ASSISTANT: Thank you. Have a nice day!.