You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I hep you?

USER: I am Pamela Collins, want to alter my recent reservation due to some emergency. Please help me in booking my ticket.

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there is no active reservation found under your name in our records.

USER: It's ok, thank you for your help.

ASSISTANT: Most welcome.