You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Collins.

ASSISTANT: How may I help you today?

USER: I am planning to visit downtown Aquarium at Houston, could you please help me with booking a flight ticket from MSP to HOU?

ASSISTANT: Sure,  may I know your travelling dates?

USER: I would like to depart on Mar 9th and return on Mar 11th.

ASSISTANT: Ok, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, there are no flight's available based on your travelling dates.

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

ASSISTANT: Thank you for approaching us.