You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

USER: I am Brandon Campbell. Owing an emergency want to change my reservation, can you help me with it please?

ASSISTANT: Sure, I am happy to help you with that.

USER: Thank you.

ASSISTANT: Please wait for a while, I will get back to you.

USER: Ok.

ASSISTANT: I found a reservation for you, can you please share your preferable journey dates?

USER: My travelling dates are 03/16 and 03/18.

ASSISTANT: Can you please mention your source and destination airport codes?

USER: My airport codes are DCA and PHX.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: That's ok. Thank you for the response.

ASSISTANT: Thank you for reaching us, have a great day.