You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am planning to attend a live concert in Houston, can you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, I am here to help you for this. Could you please share me your airport codes?

USER: My source and destination airport codes are IAD and HOU.

ASSISTANT: Can you please provide me your travel dates?

USER: I want to depart on Aug 25th and my return date will be on Aug 27th.

ASSISTANT: Is there any criteria regarding your journey?

USER: I need a economy class ticket.

ASSISTANT: Do you have any specifications?

USER: I want to return in the morning.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am William Lopez.

ASSISTANT: Sorry to inform you, no flights are found with your credentials.

USER: No issues, I'll choose any alternative. Thank you.

ASSISTANT: Thank you very much for utilising our agency.