You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know your name please?

USER: My name is Pamela Mitchell.

ASSISTANT: How may I address you?

USER: Owing an emergence, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, please wait a moment I will check the reservation list.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: Ok, no issues.

ASSISTANT: Thanks for contacting us, have a great day.

USER: Thanks for the help.