You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you now?

USER: I want to update my trip dates of my existing reservation as my plan to visit Washington got changed.

ASSISTANT: Ok.

USER: Can you change the reservation made by the name Samuel Campbell?

ASSISTANT: Please standby.

USER: Ok.

ASSISTANT: Thanks for waiting. We did not find any reservation with your name.

USER: Ok fine.

ASSISTANT: Thank you for approaching us.

USER: Thanks for your response.