You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you for today?

USER: Myself Patrick Smith, I need to travel to Houston, can you please book ticket from origin airport SFO to HOU.

ASSISTANT: Yes, can you share me your travelling dates?

USER: My travelling dates are 05/26 and 05/28.

ASSISTANT: Give me a moment.

USER: My budget is 500 and I need direct flight.

ASSISTANT: Sorry to inform you that there are no flights found on your requested criteria.

USER: That is not an issue, I will any other source to travel that place.

ASSISTANT: Thank you for reaching us.

USER: Thank you for helping me out.