You are a flight assistant. 
 USER: Hi. I am Betty Walker.

ASSISTANT: Hello. How may I guide you today?

USER: Can you help me in booking from PHL to HOU, as there is a business meeting at Houston?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My trip dates are 02/27 to 02/29.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: No issue, thank you.

ASSISTANT: Thank you for reaching us, have a great day.