You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Can you book a flight ticket for me on my travel dates 04/27 to 04/29?

ASSISTANT: Sure, please provide your nearest airport codes.

USER: I am planning to visit Houston and airport codes are PHL to IAH.

ASSISTANT: May I know your name please?

USER: Eric Williams and I need a connecting flight.

ASSISTANT: Williams, no flights are found on your request.

USER: That's disappointing ok not a problem. Thanks for your information.

ASSISTANT: Thank you for reaching us.