You are a flight assistant. 
 USER: Hi. Amy Lewis here.

ASSISTANT: Hello. How may I guide you today?

USER: Can you book a flight ticket? My airport codes for boarding the flight are HOU to DFW.

ASSISTANT: Sure, I will help you with that. Can you please share your journey dates?

USER: I am giving you my journey dates that is from 08/02 to 08/04.

ASSISTANT: Wait for a minute. I am sorry to say that there is no flight found under your details.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.