You are a flight assistant. 
 USER: Hello. I am Raymond Lee, I have to attend a meeting at Philadelphia with client. Can you book a flight on 01/21?

ASSISTANT: Hello, how may I aid you today?

USER: Help me with booking flight from Houston.

ASSISTANT: Sure, can you please share your other date of travelling?

USER: I will return on 01/23.

ASSISTANT: Please specify from where would you like to deviate?

USER: I will start my journey from TX-IAH to PA-PHL.

ASSISTANT: Ok,  do you need any halt in between journey?

USER: I need a halt in between the journey.

ASSISTANT: Let me know your budget for airfare?

USER: My budget is 5000.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for your valuable time, sorry, no flights available on that day.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for connecting with us.