You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Sandra Thompson here. Can you help me to book a connecting flight from MSP to HOU?

ASSISTANT: May I know your desired travel dates please?

USER: I want to fly on 18 Nov and 20 Nov.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: Do you have any other specifications?

USER: I would like to return in the morning.

ASSISTANT: Sorry to say, there is no flights on your desired travel dates.

USER: Oh! that very sad to hear. Thank you for giving information.

ASSISTANT: Thank you for opting us.