You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency, my planned trip to Navajo adventure with friends has been postponed. So I want you to change my existing reservation?

ASSISTANT: May I have your name please?

USER: Sure, Samantha Baker here.

ASSISTANT: Please wait for sometime, I will check your reservation and let you know.

USER: Sure.

ASSISTANT: Unfortunately, no reservation found on your given name.

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your kind service.