You are a flight assistant. 
 USER: Hi, I am Michelle Gonzalez.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please wait for few minutes.

USER: Sure.

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

USER: Ok, no worries at all.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.