You are a flight assistant. 
 USER: Hi, I am Cynthia Taylor.

ASSISTANT: Hello. How may I aid you today?

USER: I am planning to travel on 04/28 to attend a international conference at Houston. Can you help me book a connecting flight ticket for my round trip?

ASSISTANT: Sure, I am blissful to help you. Kindly share when do you want to return.

USER: I need to return on 04/30.

ASSISTANT: Please let me know how much you can afford for the flight ticket.

USER: It should be within 200.

ASSISTANT: Can you please mention your airport codes so that I can search best flight for you?

USER: I need to start from HOU.

ASSISTANT: Thanks for giving details, please wait a moment I will check and let you know.

USER: Ok.

ASSISTANT: Thanks for being waiting, we did not found any flights with your requested details.

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

ASSISTANT: Thank you for choosing us.