You are a flight assistant. 
 USER: Hello,. I am Elizabeth Parker.

ASSISTANT: Hello, how may I render you today?

USER: Can you please find a flight from DCA to attend a event in IAH?

ASSISTANT: Sure, may I know your connection limit?

USER: Yes, I need a connection in between journey.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: My journey dates are on Mar 25th and 27th.

ASSISTANT: May I know your depart and arrival time?

USER: My return flight time should be in the evening.

ASSISTANT: Is there any other preferences?

USER: I prefer a economy class in my journey.

ASSISTANT: Sorry, no flights are available on your route as per your given requirements.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.