You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you now?

USER: I am Charles Edwards planning to visit PHX, can you book a ticket from HOU?

ASSISTANT: Sure, can you please mention the travelling dates of your journey?

USER: Sure, my dates of travelling will be 04/14 and 04/16.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Charles, there are no flights found on your requested dates.

USER: That's ok, thank you.

ASSISTANT: Thank you for approaching us.