You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am looking for a connecting flight, could you please help me with finding a flight ticket with my requirement?

ASSISTANT: Sure, could you please share me with your dates of journey?

USER: I would like to depart on May 18th and return on May 20th.

ASSISTANT: Ok, may I know your respective airport codes of journey?

USER: My source airport code is IAH and destination airport code is DFW.

ASSISTANT: May I know your name please?

USER: I am Susan Anderson.

ASSISTANT: Please wait for a moment.

USER: Make sure that my return time must be afternoon.

ASSISTANT: Sorry Susan, there is no flight found as per your travelling details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: You are welcome.