You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Mark Clark here.

ASSISTANT: Nice to meet you Mark Clark.

USER: I have a seminar in New York.Can you please help me for booking a flight ticket?

ASSISTANT: Can you please mention your travel dates for booking flight ticket?

USER: My departure date is 11/26 and return date is 11/28.

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

USER: My airport codes are from DC-IAD to NY-LGA.

ASSISTANT: Ok, please wait a moment.

USER: Make sure my connections limit is 1.

ASSISTANT: Sorry as per your requested dates there is no flight ticket available with 1 connection.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for contacting us.