You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I address you?

USER: Donna Miller here. I'm planning to visit my old college, can you book a ticket from IAH to LAX?

ASSISTANT: Sure, please let me know your travel dates.

USER: Sure, my planned departure and return travel dates are 29th September and 1st October.

ASSISTANT: How many connections do you need?

USER: I need maximum 1.

ASSISTANT: At what time would you like to depart and return?

USER: I want to return in the afternoon.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Thanks for providing all your details, I regret to inform you that there are no flights obtained on your journey dates to book a flight ticket.

USER: That's fine, thank you for giving the information.

ASSISTANT: Thank you for picking us.