You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Baker here.

ASSISTANT: How may I assist you?

USER: Can you please check for the flight from JFK to SEA to attend a meeting?

ASSISTANT: Sure, we are happy to help you. May I know your planned trip dates?

USER: Actually I want to change my reservation. So, can you help me?

ASSISTANT: Ok please wait a minute. I will check your status and revert you back.

USER: Ok, I will be waiting for your response.

ASSISTANT: Thanks for waiting, there is no active reservation on your name in our records.

USER: Oh! That's very disappointing to know. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.