You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you today?

USER: Owing an emergency, I want to change my recent reservation.Can you help me with that?

ASSISTANT: Ok, please allow me to check your previous booking. I need to know your name to proceed further.

USER: Christine Smith is here.

ASSISTANT: Ok, give me a moment to check with availability of your previous reservation.

USER: Sure.

ASSISTANT: Christine Smith, there is no active reservation found under your name.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our services.

USER: Thank you for the information.

ASSISTANT: Have a nice day.