You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: My name is Christopher Thompson. I am a volunteer in blood organisation, I have to conduct some meetings at New York. Can you please book me a ticket?

ASSISTANT: That's good to hear, can I know your travel dates?

USER: Yes, my travel dates are 10/27 and 10/29.

ASSISTANT: Please give me a minute. Can I know your airport codes?

USER: My airport codes are CLT and EWR.

ASSISTANT: Sorry Thompson, there are no flights available on your request.

USER: That's ok, no issues. Thank you for your information.

ASSISTANT: You are welcome.