You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Paul Campbell.

ASSISTANT: How may I serve you today?

USER: Due to some health issue, I need to change my previous reservation. Can you help me in that?

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no recent reservation found on your name.

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.