You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jerry Baker.

ASSISTANT: How may I help you?

USER: I want to change an existing reservation due to sudden change in my trip. Can you help me?

ASSISTANT: Sure, please wait.

USER: Thank you. Ok.

ASSISTANT: Sorry, we did not found any reservations under your name.

USER: No issue. Thank you.

ASSISTANT: Thank you for reaching us.