You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am Helen Wilson.

ASSISTANT: How can I assist you?

USER: Can you please book a flight ticket with direct flight to attend a event in Houston?

ASSISTANT: Ok, may I know your travelling dates?

USER: My journey dates are, depart on Mar 8th and arrival on Mar 10th.

ASSISTANT: Can you please tell me your depart and arrival timings?

USER: My return flight time should be in the evening.

ASSISTANT: May I know your depart and arrival airport codes?

USER: My airport codes are, LAX to IAH.

ASSISTANT: May I know your connection limit?

USER: I already mentioned above.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.