You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I would like to book a flight ticket with single connection form Oakland to attend a client meeting in Houston, can you help me in booking?

ASSISTANT: Sure, We are here to assist you. May I know your name?

USER: I am Debra Thomas.

ASSISTANT: Please share me your airport codes.

USER: My boarding and landing airport codes are OAK and HOU.

ASSISTANT: When would you like to make your trip?

USER:   I need to depart on Aug 23rd and my return date will be on Aug 25th.

ASSISTANT: Is there any other specifications?

USER: No, I don't have any specifications.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found  according to your requirements.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for reaching us.