You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Alexander Nelson.

ASSISTANT: How may I render you at this moment?

USER: I would like to attend a seminar on social issues in pioneer plaza at Dallas & Fort Worth, TX - DFW. Can you please hold me a flight ticket from New York, NY - EWR?

ASSISTANT: Sure, may I know how much you can afford for the flight ticket?

USER: I can afford up to 200 only.

ASSISTANT: Sure, please tell me your journey dates?

USER: My trip dates are 08/19 - 08/21.

ASSISTANT: OK, please wait for some time, Iet me check with the availability of flights.

USER: Sure, take your time.

ASSISTANT: Sorry Alexander Nelson, there are no flights available on your requested dates.

USER: It's ok, I will check out with the another airlines. Thank you for your information.

ASSISTANT: Thank you for availing us.